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Autori principali:	Belle Collaboration, Hohmann, M., Urquijo, P., Adachi, I., Aihara, H., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Banerjee, Sw., Bauer, M., Bennett, J., Bernlochner, F., Bessner, M., Bhuyan, B., Bilka, T., Biswas, D., Bobrov, A., Bodrov, D., Bonvicini, G., Borah, J., Bozek, A., Bračko, M., Branchini, P., Browder, T. E., Budano, A., Campajola, M., Cao, L., Chang, M. -C., Cheon, B. G., Cho, K., Choi, S. -K., Choi, Y., Das, S., Dash, N., De Nardo, G., De Pietro, G., Dhamija, R., Dingfelder, J., Doležal, Z., Dong, T. V., Dubey, S., Ecker, P., Ferber, T., Ferlewicz, D., Frey, A., Fulsom, B. G., Gaur, V., Giri, A., Goldenzweig, P., Graziani, E., Gu, T., Gudkova, K., Hadjivasiliou, C., Hartbrich, O., Hayasaka, K., Hayashii, H., Hazra, S., Hedges, M. T., Herrmann, D., Hou, W. -S., Hsu, C. -L., Inami, K., Ishikawa, A., Itoh, R., Iwasaki, M., Jacobs, W. W., Ji, Q. P., Jia, S., Jin, Y., Kawasaki, T., Kiesling, C., Kim, D. Y., Kim, K. -H., Kim, Y. -K., Kinoshita, K., Korobov, A., Kovalenko, E., Križan, P., Kuhr, T., Kumar, M., Kumar, R., Kumara, K., Kwon, Y. -J., Lam, T., Laurenza, M., Lee, S. C., Levit, D., Lewis, P., Li, L. K., Gioi, L. Li, Liventsev, D., Masuda, M., Matsuda, T., Matvienko, D., Maurya, S. K., Meier, F., Merola, M., Metzner, F., Mizuk, R., Miyabayashi, K., Mohanty, G. B., Mussa, R., Nakao, M., Natkaniec, Z., Natochii, A., Nayak, L., Nishida, S., Ogawa, S., Ono, H., Oskin, P., Pakhlova, G., Pardi, S., Park, H., Park, J., Park, S. -H., Passeri, A., Patra, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Podobnik, T., Prencipe, E., Prim, M. T., Röhrken, M., Rozanska, M., Russo, G., Sandilya, S., Savinov, V., Schnell, G., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Shan, W., Sharma, C., Shiu, J. -G., Shwartz, B., Solovieva, E., Starič, M., Sumihama, M., Sumisawa, K., Takizawa, M., Tanida, K., Tenchini, F., Trabelsi, K., Uchida, M., Uno, S., Vahsen, S. E., Varvell, K. E., Vinokurova, A., Wang, M. -Z., Won, E., Yabsley, B. D., Yan, W., Yang, S. B., Yook, Y., Zhilich, V., Zhukova, V.
Natura:	Preprint
Pubblicazione:	2023
Soggetti:	High Energy Physics - Experiment
Accesso online:	https://arxiv.org/abs/2311.00458
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author	Belle Collaboration Hohmann, M. Urquijo, P. Adachi, I. Aihara, H. Asner, D. M. Aushev, T. Ayad, R. Babu, V. Banerjee, Sw. Bauer, M. Bennett, J. Bernlochner, F. Bessner, M. Bhuyan, B. Bilka, T. Biswas, D. Bobrov, A. Bodrov, D. Bonvicini, G. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T. E. Budano, A. Campajola, M. Cao, L. Chang, M. -C. Cheon, B. G. Cho, K. Choi, S. -K. Choi, Y. Das, S. Dash, N. De Nardo, G. De Pietro, G. Dhamija, R. Dingfelder, J. Doležal, Z. Dong, T. V. Dubey, S. Ecker, P. Ferber, T. Ferlewicz, D. Frey, A. Fulsom, B. G. Gaur, V. Giri, A. Goldenzweig, P. Graziani, E. Gu, T. Gudkova, K. Hadjivasiliou, C. Hartbrich, O. Hayasaka, K. Hayashii, H. Hazra, S. Hedges, M. T. Herrmann, D. Hou, W. -S. Hsu, C. -L. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Jacobs, W. W. Ji, Q. P. Jia, S. Jin, Y. Kawasaki, T. Kiesling, C. Kim, D. Y. Kim, K. -H. Kim, Y. -K. Kinoshita, K. Korobov, A. Kovalenko, E. Križan, P. Kuhr, T. Kumar, M. Kumar, R. Kumara, K. Kwon, Y. -J. Lam, T. Laurenza, M. Lee, S. C. Levit, D. Lewis, P. Li, L. K. Gioi, L. Li Liventsev, D. Masuda, M. Matsuda, T. Matvienko, D. Maurya, S. K. Meier, F. Merola, M. Metzner, F. Mizuk, R. Miyabayashi, K. Mohanty, G. B. Mussa, R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nishida, S. Ogawa, S. Ono, H. Oskin, P. Pakhlova, G. Pardi, S. Park, H. Park, J. Park, S. -H. Passeri, A. Patra, S. Paul, S. Pedlar, T. K. Pestotnik, R. Piilonen, L. E. Podobnik, T. Prencipe, E. Prim, M. T. Röhrken, M. Rozanska, M. Russo, G. Sandilya, S. Savinov, V. Schnell, G. Schwanda, C. Schwartz, A. J. Seino, Y. Senyo, K. Shan, W. Sharma, C. Shiu, J. -G. Shwartz, B. Solovieva, E. Starič, M. Sumihama, M. Sumisawa, K. Takizawa, M. Tanida, K. Tenchini, F. Trabelsi, K. Uchida, M. Uno, S. Vahsen, S. E. Varvell, K. E. Vinokurova, A. Wang, M. -Z. Won, E. Yabsley, B. D. Yan, W. Yang, S. B. Yook, Y. Zhilich, V. Zhukova, V.
author_facet	Belle Collaboration Hohmann, M. Urquijo, P. Adachi, I. Aihara, H. Asner, D. M. Aushev, T. Ayad, R. Babu, V. Banerjee, Sw. Bauer, M. Bennett, J. Bernlochner, F. Bessner, M. Bhuyan, B. Bilka, T. Biswas, D. Bobrov, A. Bodrov, D. Bonvicini, G. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T. E. Budano, A. Campajola, M. Cao, L. Chang, M. -C. Cheon, B. G. Cho, K. Choi, S. -K. Choi, Y. Das, S. Dash, N. De Nardo, G. De Pietro, G. Dhamija, R. Dingfelder, J. Doležal, Z. Dong, T. V. Dubey, S. Ecker, P. Ferber, T. Ferlewicz, D. Frey, A. Fulsom, B. G. Gaur, V. Giri, A. Goldenzweig, P. Graziani, E. Gu, T. Gudkova, K. Hadjivasiliou, C. Hartbrich, O. Hayasaka, K. Hayashii, H. Hazra, S. Hedges, M. T. Herrmann, D. Hou, W. -S. Hsu, C. -L. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Jacobs, W. W. Ji, Q. P. Jia, S. Jin, Y. Kawasaki, T. Kiesling, C. Kim, D. Y. Kim, K. -H. Kim, Y. -K. Kinoshita, K. Korobov, A. Kovalenko, E. Križan, P. Kuhr, T. Kumar, M. Kumar, R. Kumara, K. Kwon, Y. -J. Lam, T. Laurenza, M. Lee, S. C. Levit, D. Lewis, P. Li, L. K. Gioi, L. Li Liventsev, D. Masuda, M. Matsuda, T. Matvienko, D. Maurya, S. K. Meier, F. Merola, M. Metzner, F. Mizuk, R. Miyabayashi, K. Mohanty, G. B. Mussa, R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nishida, S. Ogawa, S. Ono, H. Oskin, P. Pakhlova, G. Pardi, S. Park, H. Park, J. Park, S. -H. Passeri, A. Patra, S. Paul, S. Pedlar, T. K. Pestotnik, R. Piilonen, L. E. Podobnik, T. Prencipe, E. Prim, M. T. Röhrken, M. Rozanska, M. Russo, G. Sandilya, S. Savinov, V. Schnell, G. Schwanda, C. Schwartz, A. J. Seino, Y. Senyo, K. Shan, W. Sharma, C. Shiu, J. -G. Shwartz, B. Solovieva, E. Starič, M. Sumihama, M. Sumisawa, K. Takizawa, M. Tanida, K. Tenchini, F. Trabelsi, K. Uchida, M. Uno, S. Vahsen, S. E. Varvell, K. E. Vinokurova, A. Wang, M. -Z. Won, E. Yabsley, B. D. Yan, W. Yang, S. B. Yook, Y. Zhilich, V. Zhukova, V.
contents	We present a measurement of the ratio of partial branching fractions of the semi-leptonic inclusive decays, $\overline{B} \to X_{u} \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$, where $\ell = (e, μ)$, using the full Belle sample of $772 \times 10^{6}$ $B \kern 0.18em\overline{\kern -0.18em B}$ pairs collected at the $Υ(4S)$ resonance. The ratio is measured via a two-dimensional fit to the squared four-momentum transfer to the lepton pair, and the charged lepton energy in the $B$ meson rest frame, where the latter must be larger than $1$ Ge\kern -0.1em V, covering approximately $86\%$ and $78\%$ of the $\overline{B} \to X_{u} \ell \overlineν$ and $\overline{B} \to X_{c} \ell \overlineν$ phase space, respectively. We find $Δ\mathcal{B}(\overline{B} \to X_{u} \ell \overlineν)/ Δ\mathcal{B}(\overline{B} \to X_{c} \ell \overlineν) = (1.99 \pm 0.17_{\rm stat} \pm 0.16_{\rm syst}) \times 10^{-2}$ where the uncertainties are statistical and systematic, respectively. In addition, we report the partial branching fractions separately for charged and neutral $B$ meson decays, and for electron and muon decay channels. We place a limit on isospin breaking in $\overline{B} \to X_{u} \ell \overlineν$ decays, and find no indication of lepton flavor universality violation in either the charmed or charmless mode. Furthermore, we unfold the $\overline{B} \to X_{u} \ell \overlineν$ and $\overline{B} \to X_{c} \ell \overlineν$ yields and report the differential ratio in lepton energy and four-momentum transfer squared.
format	Preprint
id	arxiv_https___arxiv_org_abs_2311_00458
institution	arXiv
publishDate	2023
record_format	arxiv
spellingShingle	Measurement of the Ratio of Partial Branching Fractions of Inclusive $\overline{B} \to X_u \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$ and the Ratio of their Spectra with Hadronic Tagging Belle Collaboration Hohmann, M. Urquijo, P. Adachi, I. Aihara, H. Asner, D. M. Aushev, T. Ayad, R. Babu, V. Banerjee, Sw. Bauer, M. Bennett, J. Bernlochner, F. Bessner, M. Bhuyan, B. Bilka, T. Biswas, D. Bobrov, A. Bodrov, D. Bonvicini, G. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T. E. Budano, A. Campajola, M. Cao, L. Chang, M. -C. Cheon, B. G. Cho, K. Choi, S. -K. Choi, Y. Das, S. Dash, N. De Nardo, G. De Pietro, G. Dhamija, R. Dingfelder, J. Doležal, Z. Dong, T. V. Dubey, S. Ecker, P. Ferber, T. Ferlewicz, D. Frey, A. Fulsom, B. G. Gaur, V. Giri, A. Goldenzweig, P. Graziani, E. Gu, T. Gudkova, K. Hadjivasiliou, C. Hartbrich, O. Hayasaka, K. Hayashii, H. Hazra, S. Hedges, M. T. Herrmann, D. Hou, W. -S. Hsu, C. -L. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Jacobs, W. W. Ji, Q. P. Jia, S. Jin, Y. Kawasaki, T. Kiesling, C. Kim, D. Y. Kim, K. -H. Kim, Y. -K. Kinoshita, K. Korobov, A. Kovalenko, E. Križan, P. Kuhr, T. Kumar, M. Kumar, R. Kumara, K. Kwon, Y. -J. Lam, T. Laurenza, M. Lee, S. C. Levit, D. Lewis, P. Li, L. K. Gioi, L. Li Liventsev, D. Masuda, M. Matsuda, T. Matvienko, D. Maurya, S. K. Meier, F. Merola, M. Metzner, F. Mizuk, R. Miyabayashi, K. Mohanty, G. B. Mussa, R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nishida, S. Ogawa, S. Ono, H. Oskin, P. Pakhlova, G. Pardi, S. Park, H. Park, J. Park, S. -H. Passeri, A. Patra, S. Paul, S. Pedlar, T. K. Pestotnik, R. Piilonen, L. E. Podobnik, T. Prencipe, E. Prim, M. T. Röhrken, M. Rozanska, M. Russo, G. Sandilya, S. Savinov, V. Schnell, G. Schwanda, C. Schwartz, A. J. Seino, Y. Senyo, K. Shan, W. Sharma, C. Shiu, J. -G. Shwartz, B. Solovieva, E. Starič, M. Sumihama, M. Sumisawa, K. Takizawa, M. Tanida, K. Tenchini, F. Trabelsi, K. Uchida, M. Uno, S. Vahsen, S. E. Varvell, K. E. Vinokurova, A. Wang, M. -Z. Won, E. Yabsley, B. D. Yan, W. Yang, S. B. Yook, Y. Zhilich, V. Zhukova, V. High Energy Physics - Experiment We present a measurement of the ratio of partial branching fractions of the semi-leptonic inclusive decays, $\overline{B} \to X_{u} \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$, where $\ell = (e, μ)$, using the full Belle sample of $772 \times 10^{6}$ $B \kern 0.18em\overline{\kern -0.18em B}$ pairs collected at the $Υ(4S)$ resonance. The ratio is measured via a two-dimensional fit to the squared four-momentum transfer to the lepton pair, and the charged lepton energy in the $B$ meson rest frame, where the latter must be larger than $1$ Ge\kern -0.1em V, covering approximately $86\%$ and $78\%$ of the $\overline{B} \to X_{u} \ell \overlineν$ and $\overline{B} \to X_{c} \ell \overlineν$ phase space, respectively. We find $Δ\mathcal{B}(\overline{B} \to X_{u} \ell \overlineν)/ Δ\mathcal{B}(\overline{B} \to X_{c} \ell \overlineν) = (1.99 \pm 0.17_{\rm stat} \pm 0.16_{\rm syst}) \times 10^{-2}$ where the uncertainties are statistical and systematic, respectively. In addition, we report the partial branching fractions separately for charged and neutral $B$ meson decays, and for electron and muon decay channels. We place a limit on isospin breaking in $\overline{B} \to X_{u} \ell \overlineν$ decays, and find no indication of lepton flavor universality violation in either the charmed or charmless mode. Furthermore, we unfold the $\overline{B} \to X_{u} \ell \overlineν$ and $\overline{B} \to X_{c} \ell \overlineν$ yields and report the differential ratio in lepton energy and four-momentum transfer squared.
title	Measurement of the Ratio of Partial Branching Fractions of Inclusive $\overline{B} \to X_u \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$ and the Ratio of their Spectra with Hadronic Tagging
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2311.00458

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